Headbox for vertical double-wire paper machine

Claim 1

In a papermaking machine including a pair of breast rolls positioned in spaced parallel relationship to each other, support means positioned beneath each of said breast rolls in spaced relation thereto, and an endless porous belt wrapping each of said breast rolls and support means therebelow to provide a pair of opposed vertically extending reaches defining a forming zone, the improvement comprising: a. a stock chamber having a bottom wall mounted above and extending across said papermaking machine, b. a plurality of tubes having inlet ends mounted in said bottom wall, c. said tubes being arranged in a plurality of rows transversely of said papermaking machine and extending in substantially parallel relationship to each other from said bottom wall toward said forming zone, d. a first slice lip having an inner substantially planar surface extending from outlet ends of said tubes to a point adjacent said breast rolls in substantially parallel relationship to said reaches and in substantial alignment with said forming zone, e. a second slice lip having an inner surface mounted in opposed relationship to said first slice lip and extending from said outlet ends of said tubes toward said forming zone in converging relationship to said first slice lip inner surface, f. the outer edges of said tubes in the outermost rows being substantially aligned with upstream ends of said inner surface of said slice lips, g. said first slice lip further including a wall extending in spaced parallel relationship to said substantially planar surface and a pair of end walls cooperatively defining a chamber therebetween, h. means defining a liquid inlet into said chamber, i. means defining a liquid outlet from said chamber, and j. means for supplying fluid to said liquid inlet defining means.